1 - 4 DS457-XX20004ZZWW Fixed Mount Imager Integration Guide
DS457 Decoder/Interface Board
Atmel AT91SAM9G20 Processor
The digital system is built on an Atmel AT91SAM9G20, a RISC processor based on ARM v5TEJ architecture.
The major features of the core are:
•
CPU clock speed up to 400 MHz with external LP SDRAM bus speed of 133 MHz
•
32 KB instruction/32 KB data cache, 256 KB instruction cache, 32 KB internal SRAM
Power Management
The DS457 decoder/interface board has various power management options depending on the host interface.
•
USB (SNAPI, USB HID Keyboard, etc.) - The DS457 automatically manages its power usage, including
USB suspend mode. Additionally, when drawing power from the USB bus, the DS457 does not exceed
the USB limit of 500 mA.
•
SSI or RS-232 - When using SSI or any RS-232 host interface, the DS457 uses one of the following power
modes. See Power Mode (RS-232 Hosts Only) on page 6-15.
• Continuous Power: The DS457 is fully awake and running, even when not in a decode session.
• Low Power (default): The DS457 draws less current at idle than when in Continuous Power mode.
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